Medical device for treating broken bones or fixing stabilising elements to bone parts

Abstract

A medical device for fixing bone parts or for fixing stabilizing elements to bone parts. A rigid outer tube is provided with at least two opposed recesses on the side that is positioned in the bone. A second inner tube is accommodated in the rigid outer tube. The inner tube is provided with at least two strips extending in the longitudinal direction of the inner tube on the side that is positioned in the bone. The medical device is provided with a device for loading the inner tube in the axial direction, in such a manner that a pressure force is exerted on the strips, which pressure force causes the strips to bend outwards through the recesses.

1. A medical device suitable for fixing bone parts, comprising
 a rigid outer tube, which is provided with at least two opposed recesses near the first end positioned in the bone, 
 an inner tube that can be accommodated in the rigid outer tube, which inner tube is provided with at least two strips extending in the longitudinal direction of the inner tube on the side that is positioned in the bone, as well as 
 means for loading the inner tube in axial direction, in such a manner that a pressure force exerted on said strips causes the strips to bend outwards through the aforesaid recesses, which means for loading the inner tube in axial direction are made up of a screw that fits in another end of the outer tube that is positioned in the bone, which screw mates with a screw thread present on the inner wall of the outer tube, wherein the first end of the outer tube that is positioned in the bone is arranged to exert a pressure force on the outwardly bending strips by suitably turning the screw, characterised in that the connection between the outer tube and the inner tube is formed by an annular wire, which is accommodated in corresponding grooves formed in the inner wall of the outer tube and the outer wall of the inner tube. 
 
     
     
       2. The medical device according to  claim 1 , characterised in that the inner tube is connected to the screw, which screw is hollow. 
     
     
       3. The medical device according to  claim 1 , characterised in that the connection between the screw and the inner tube is formed by an annular wire, which is accommodated in corresponding grooves in the outer wall of the inner tube and the inner circumference of the screw. 
     
     
       4. The medical device according to  claim 1 , characterised in that said strips comprise a weakened portion at the location of their centre, seen in the longitudinal direction of the strips. 
     
     
       5. The medical device according to  claim 4 , characterised in that said weakened portion is formed by a cut, an indentation or one or more holes. 
     
     
       6. The medical device according to  claim 1 , characterised in that the outer tube is provided with one or more upright sections. 
     
     
       7. The medical device according  claim 1 , characterised in that the other end positioned outside the bone is slidingly accommodated in a receiving device, which receiving device is connected at an angle to a plate that can be fixed to a part of the broken hipbone, and in that the side that is positioned in the bone is fixed in the other part of the broken hipbone. 
     
     
       8. The medical device according to  claim 7 , characterised in that the side that is not positioned in the bone is slidingly accommodated in an opening of a pin which is placed in the intramedullary cavity of the upper leg. 
     
     
       9. The medical device for immobilising two bones connected by one or more joints, in particular vertebrae, according to  claim 1 , characterised in that the other end not positioned in the bone can be connected to stabilising elements, and wherein the first end that is positioned in the bone can be inserted into the pedicle of the vertebra.